Form 497K AQR Funds

AQR Small Cap Momentum Style Fund

Fund Summary — January 29, 2018

Ticker: Class R6/QSMRX

Before you invest, you may want to review the Fund’s prospectus, which contains more information about the Fund and its risks. You can find the Fund’s prospectus and other information about the Fund, including the statement of additional information and most recent shareholder report, online at https://funds.aqr.com/fund-documents. You can also get this information at no cost by calling (866) 290-2688 or by sending an email to [email protected]. The Fund’s prospectus and statement of additional information, each dated January 29, 2018, as amended and supplemented from time to time, and the Fund’s most recent shareholder report, dated September 30, 2017, are all incorporated by reference to this summary prospectus.

Investment Objective

The AQR Small Cap Momentum Style Fund (the “Fund”) seeks long-term capital appreciation.

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

	Class R6
Management Fee	0.45%
Distribution (12b-1) Fee	None
Other Expenses	0.09%
Total Annual Fund Operating Expenses	0.54%
Less: Fee Waivers and/or Expense Reimbursements1	0.04%
Total Annual Fund Operating Expenses after Fee Waivers and/or Expense Reimbursements	0.50%

1

The Adviser has contractually agreed to waive its management fee and/or to reimburse expenses of the Fund to the extent necessary to maintain the total annual fund operating expenses (excluding interest, taxes, dividends on short sales, borrowing costs, acquired fund fees and expenses, interest expense relating to short sales, expenses related to class action claims and extraordinary expenses) at no more than 0.50% for Class R6 Shares (the “Fee Waiver Agreement”). This arrangement will continue at least through January 28, 2019. The Fee Waiver Agreement may only be terminated with the consent of the Board of Trustees, including a majority of the Trustees of the Trust who are not “interested persons” of the Trust within the meaning of the 1940 Act. The Adviser is entitled to recapture the fees waived and/or expenses reimbursed, only to the extent that the recapture can be made during the thirty-six months following the end of the month during which the Adviser waived fees or reimbursed expenses. In no case will the Adviser recapture any amount that would cause the aggregate operating expenses of the Fund attributable to a share class during a year in which a repayment is made to exceed the lesser of (i) the applicable limits in effect at the time of the waiver and/or reimbursement, or (ii) the applicable limits in effect at the time of recapture.

Example: This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same and takes into account the effect of the Fee Waiver Agreement through January 28, 2019, as discussed in Footnote No. 1 to the Fee Table. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

	1 Year	3 Years	5 Years	10 Years
Class R6 Shares	$51	$169	$298	$673

AQR Funds–Summary Prospectus2

Portfolio Turnover: The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover may indicate higher transaction costs and may result in higher taxes when shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund’s performance. During the fiscal year ended September 30, 2017, the Fund’s portfolio turnover rate was 86% of the average value of its portfolio.

Principal Investment Strategies of the Fund

The Fund pursues a momentum investment style by investing primarily in equity or equity-related securities (including, but not limited to, exchange-traded funds, equity index futures, and depositary receipts) of small-cap companies traded on a principal U.S. exchange or over-the-counter market that the Adviser determines to have positive momentum. The Adviser considers a security to have positive momentum primarily if it has outperformed other securities on a relative basis over a recent time period. Relative performance may be based on price momentum, earnings momentum, or other types of momentum, and will generally be measured over time periods ranging from one to twelve months. The criteria the Adviser uses for determining positive momentum may change from time to time.

Under normal market circumstances, the Fund will invest at least 80% of its net assets (including any borrowings for investment purposes) in small-cap U.S. companies. As of the date of this prospectus, the Adviser considers small-cap U.S. companies to be those companies with market capitalizations within the range of the Russell 2000^® Index at the time of purchase.

The Adviser determines the weight of each security in the portfolio using a combination of the market capitalization of the security and the Adviser’s determination of the attractiveness of the security based on the Adviser’s assessment of the security’s momentum and additional criteria that form part of the Adviser’s security selection process.

The Adviser believes that effective management of transaction costs is essential. Transaction costs include commissions, bid-ask spreads, market impact and time delays (the time between the investment decision and implementation, during which a market may move in favor of or against the Fund). The Adviser will seek to strike a balance between maintaining the desired exposure to positive momentum while attempting to keep transaction costs reasonably low.

The Fund invests significantly in common stocks. The Fund may also invest in or use financial futures contracts and other types of equity-linked derivative instruments such as equity swaps and equity index swaps, as well as exchange-traded funds and similar pooled investment vehicles to gain exposure to the equity market and to maintain liquidity to pay for redemptions. A portion of the Fund’s assets may be held in cash or cash-equivalent investments, including, but not limited to, short-term investment funds.

To attempt to increase its income or total return, the Fund may lend its portfolio securities to certain types of eligible borrowers.

Principal Risks of Investing in the Fund

Risk is inherent in all investing. The value of your investment in the Fund, as well as the amount of return you receive on your investment, may fluctuate significantly from day to day and over time. You may lose part or all of your investment in the Fund or your investment may not perform as well as other similar investments. The Fund is not a complete investment program and should be considered only as one part of an investment portfolio. The Fund is more appropriate for long-term investors who can bear the risk of short-term NAV fluctuations, which at times, may be significant and rapid, however, all investments long- or short-term are subject to risk of loss. The following is a summary description of certain risks of investing in the Fund.

Common Stock Risk: The Fund may invest in, or have exposure to, common stocks. Common stocks are subject to greater fluctuations in market value than certain other asset classes as a result of such factors as a company’s business performance, investor perceptions, stock market trends and general economic conditions.

Counterparty Risk: The Fund may enter into various types of derivative contracts. Many of these derivative contracts will be privately negotiated in the over-the-counter market. These contracts also involve exposure to credit risk, since contract performance depends in part on the financial condition of the counterparty. If a privately negotiated over-the-counter contract calls for payments by the Fund, the Fund must be prepared to make such payments when due. In addition, if a counterparty’s creditworthiness declines, the Fund may not receive payments owed under the contract, or such payments may be delayed under such circumstances and the value of agreements with such counterparty can be expected to decline, potentially resulting in losses to the Fund.

Derivatives Risk: In general, a derivative instrument typically involves leverage, i.e., it provides exposure to potential gain or loss from a change in the level of the market price of the underlying security, currency or commodity (or a basket or index) in a notional amount that exceeds the amount of cash or assets required to establish or maintain the derivative instrument. Adverse changes in the value or level of the underlying asset or index, which the Fund may not directly own, can result in a loss to the Fund substantially greater than the amount invested in the derivative itself. The use of derivative instruments also exposes the Fund to additional risks and transaction costs. These instruments come in many varieties and have a wide

AQR Funds–Summary Prospectus3

range of potential risks and rewards, and may include, as further described in the section entitled “Principal Investment Strategies of the Fund,” futures contracts and swaps. A risk of the Fund’s use of derivatives is that the fluctuations in their values may not correlate perfectly with the overall securities markets. Additionally, to the extent the Fund is required to segregate or “set aside” (often referred to as “asset segregation”) liquid assets or otherwise cover open positions with respect to certain derivative instruments, the Fund may be required to sell portfolio instruments to meet these asset segregation requirements. There is a possibility that segregation involving a large percentage of the Fund’s assets could impede portfolio management or the Fund’s ability to meet redemption requests or other current obligations.

Futures Contract Risk: The successful use of futures contracts draws upon the Adviser’s  skill and experience with respect to such instruments and are subject to special risk considerations. The primary risks associated with the use of futures contracts, which may adversely affect the Fund’s NAV and total return, are (a) the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the futures contract; (b) possible lack of a liquid secondary market for a futures contract and the resulting inability to close a futures contract when desired; (c) losses caused by unanticipated market movements, which are potentially unlimited; (d) the Adviser’s  inability to predict correctly the direction of securities prices, interest rates, currency exchange rates and other economic factors; (e) the possibility that the counterparty will default in the performance of its obligations; and (f) if the Fund has insufficient cash, it may have to sell securities from its portfolio to meet daily variation margin requirements, and the Fund may have to sell securities at a time when it may be disadvantageous to do so.

Investment in Other Investment Companies Risk: As with other investments, investments in other investment companies, including exchange-traded funds (“ETFs”), are subject to market and manager risk. In addition, if the Fund acquires shares of investment companies, shareholders bear both their proportionate share of expenses in the Fund (including management and advisory fees) and, indirectly, the expenses of the investment companies. The Fund may invest in money market mutual funds. An investment in a money market mutual fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Although money market mutual funds that invest in U.S. government securities seek to preserve the value of the Fund’s investment at $1.00 per share, it is possible to lose money by investing in a stable NAV money market mutual fund. Moreover, recent SEC rule amendments require prime money market mutual funds to use floating NAVs that do not preserve the value of the Fund’s investment at $1.00 per share. These rule amendments may impact the Fund’s use of prime money market mutual funds for capital preservation purposes.

Manager Risk: If the Adviser makes poor investment decisions, it will negatively affect the Fund’s investment performance.

Market Risk: Market risk is the risk that the markets on which the Fund’s investments trade will increase or decrease in value. Prices may fluctuate widely over short or extended periods in response to company, market or economic news. Markets also tend to move in cycles, with periods of rising and falling prices. If there is a general decline in the securities and other markets, your investment in the Fund may lose value, regardless of the individual results of the securities and other instruments in which the Fund invests.

Model and Data Risk: Given the complexity of the investments and strategies of the Fund, the Adviser relies heavily on quantitative models and information and data supplied by third parties (“Models and Data”). Models and Data are used to construct sets of transactions and investments, to provide risk management insights, and to assist in hedging the Fund’s investments.

When Models and Data prove to be incorrect or incomplete, any decisions made in reliance thereon expose the Fund to potential risks. Similarly, any hedging based on faulty Models and Data may prove to be unsuccessful. Some of the models used by the Adviser for the Fund are predictive in nature. The use of predictive models has inherent risks. Because predictive models are usually constructed based on historical data supplied by third parties, the success of relying on such models may depend heavily on the accuracy and reliability of the supplied historical data. The Fund bears the risk that the quantitative models used by the Adviser will not be successful in selecting companies for investment or in determining the weighting of investment positions that will enable the Fund to achieve its investment objective.

All models rely on correct market data inputs. If incorrect market data is entered into even a well-founded model, the resulting information will be incorrect. However, even if market data is input correctly, “model prices” will often differ substantially from market prices, especially for instruments with complex characteristics, such as derivative instruments.

Momentum Style Risk: Investing in or having exposure to securities with positive momentum entails investing in securities that have had above-average recent returns. These securities may be more volatile than a broad cross-section of securities. In addition, there may be periods during which the investment performance of the Fund while using a momentum strategy may suffer.

Securities Lending Risk: The Fund’s risk in lending portfolio securities, as with other extensions of credit, consists of the possibility of loss to the Fund due to (i) the inability of the borrower to return the securities, (ii) a delay in receiving additional collateral to adequately cover any fluctuations in the value of securities on loan, (iii) a delay in recovery of the securities, or (iv) the loss of rights in the collateral should the borrower fail financially. In addition, the Fund is responsible for any loss that might result from its investment of the borrower’s collateral.

AQR Funds–Summary Prospectus4

Small-Cap Securities Risk: Investments in or exposure to the securities of companies with smaller market capitalizations involve higher risks in some respects than do investments in securities of larger companies. For example, prices of such securities are often more volatile than prices of large capitalization securities. In addition, due to thin trading in some such securities, an investment in these securities may be more illiquid (i.e., harder to sell) than that of larger capitalization securities. Smaller capitalization companies also fail more often than larger companies and may have more limited management and financial resources than larger companies.

Performance Information

The performance information below shows summary performance information for the Fund in a bar chart and an average annual total returns table. The information shows you how the Fund’s performance has varied year by year and provides some indication of the risks of investing in the Fund. The Fund commenced operations on July 9, 2009, however, the Class R6 Shares commenced operations on July 10, 2014.

The Fund’s past performance (before and after taxes), as provided by the bar chart and performance table that follows, is not an indication of future results. Updated information on the Fund’s performance, including its current NAV per share and the performance of other classes of the Fund, can be obtained by visiting https://funds.aqr.com.

Class R6 Shares—Total Returns

The bar chart below provides an illustration of how the Fund’s Class R6 Shares’ performance has varied in each of the indicated calendar years.

Highest Quarterly Return	Lowest Quarterly Return
7.41% (3Q17)	-11.54% (3Q15)

Average Annual Total Returns as of December 31, 2017

The following table compares the Fund’s average annual total returns for Class R6 Shares as of December 31, 2017 to the Russell 2000^® Index. You cannot invest directly in an index. The table includes all applicable fees and sales charges.

	One Year	Since Inception of Class R6 Shares (July 10, 2014)
AQR Small Cap Momentum Style Fund—Class R6
Return Before Taxes	17.49%	8.67%
Return After Taxes on Distributions	14.94%	6.93%
Return After Taxes on Distributions and Sale of Fund Shares	12.00%	6.49%
Russell 2000® Index (reflects no deductions for fees, expenses or taxes)	14.65%	9.86%

After-tax returns are calculated using the historical highest individual marginal tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown, and after-tax returns are not relevant to investors who hold their Fund shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts. After-tax returns for other classes will vary.

Investment Manager

The Fund’s investment manager is AQR Capital Management, LLC.

AQR Funds–Summary Prospectus5

Portfolio Managers

Name	Portfolio Manager of the Fund Since	Title
Clifford S. Asness, Ph.D., M.B.A.	July 9, 2009	Managing and Founding Principal of the Adviser
Andrea Frazzini, Ph.D., M.S.	May 1, 2012	Principal of the Adviser
Jacques A. Friedman, M.S.	July 9, 2009	Principal of the Adviser
Ronen Israel, M.A.	July 9, 2009	Principal of the Adviser

Important Additional Information

PURCHASE AND SALE OF FUND SHARES

You may purchase or redeem Class R6 Shares of the Fund each day the NYSE is open. To purchase or redeem shares you should contact your financial intermediary, or, if you hold your shares through the Fund, you should contact the Fund by phone at (866) 290-2688, by mail (c/o AQR Funds, P.O. Box 2248, Denver, CO 80201-2248), or by the Internet at https://funds.aqr.com. The Fund’s initial and subsequent investment minimums for Class R6 Shares generally are as follows.

	Class R6 Shares
Minimum Initial Investment	$50,000,000 1
Minimum Subsequent Investment	None

1	Reductions apply to certain eligibility groups. See “Investing with the AQR Funds” in the Fund’s prospectus.

Tax Information

The Fund’s dividends and distributions may be subject to federal income taxes and may be taxed as ordinary income or capital gains, unless you are a tax-exempt investor or are investing through a retirement plan, in which case you may be subject to federal income tax upon withdrawal from such tax deferred arrangements.

Payments to Broker/Dealers and other Financial Intermediaries

If you purchase shares of the Fund through a broker-dealer or other financial intermediary, the Adviser or its affiliates may pay the intermediary for the sale of Fund shares and other services. These payments may create a conflict of interest by influencing the broker-dealer or other financial intermediary and your individual financial professional to recommend the Fund over another investment. Ask your individual financial professional or visit your financial intermediary’s website for more information.  

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